In the hot sunny summer I get about an inch of water loss a week from evaporation. I don't bother to refill the pool with a hose until it is at least an inch below the drain. If it is an inch below the drain, in a long heavy rain my pool will over fill, but a lighter or shorter rain might only fill it half an inch. I thought if I ran something from the down spout it might be better.I'm just not sure why you want to do this. My pool overfills when it rains and only needs water when there's no rain.
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